Denotes someone who verbally "lights a fire under people" to try and persuade them to give him some ass, either literally or figuratively (i.e., he may not literally ask for sexual favors, but he will request something "equally momentous" that far exceeds what he could reasonably expect under the circumstances). This intense and persistent pressuring could include attempted bribery, laying a guilt trip on the person, offering to forgive a debt/obligation that the potential provider owes him, refusing to provide much-needed assistance unless the person "submits his cheeks", etc.

Motorist who has slid into a ditch: I would rather pay a tow truck than call Harry for help --- he's such an awful arsenist!